A parallel nonlinear solver [9] is implemented in the flowsheeting package SPEEDUP. The implementation is done by integrating the solver into the package being then transparent to the user. It is tested by using two steady state simulation problems. The first is a small flowsheet involving only 1633 variables. The second example consists of a flowsheet with two columns, resulting in a problem with 5668 equations. Two MIMD parallel machines are considered. The first is a cluster of workstations running with PVM. The other is a proper parallel machine, a FUJITSU AP1000. The larger problem is tested in both machines to compare the parallel performance.